package com.smart.community.region.service.impl;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.CachePut;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;

import com.smart.community.region.service.ICacheService;
import com.smart.community.region.vo.ImportProgress;

import lombok.extern.slf4j.Slf4j;

/**
 * 缓存服务实现类
 * 
 * 功能说明：
 * 1. 提供模板数据缓存功能
 * 2. 提供验证结果缓存功能
 * 3. 提供导入进度缓存功能
 * 4. 使用Spring Cache注解替代手动Redis操作
 * 5. 支持缓存清理功能
 * 
 * @author Wu.Liang
 * @since 2025-01-30
 * @version 2.0.0 - 重构为Spring Cache注解
 */
@Slf4j
@Service
public class CacheServiceImpl implements ICacheService {

    @Override
    @CachePut(value = "template:data", key = "#fileId")
    public Map<String, List<Map<String, Object>>> cacheTemplateData(String fileId, Map<String, List<Map<String, Object>>> data, long expireMinutes) {
        log.info("缓存模板数据，文件ID：{}，过期时间：{}分钟", fileId, expireMinutes);
        // 返回数据，Spring Cache会自动处理缓存存储
        return data;
    }

    @Override
    @Cacheable(value = "template:data", key = "#fileId")
    public Map<String, List<Map<String, Object>>> getCachedTemplateData(String fileId) {
        log.info("从缓存获取模板数据，文件ID：{}", fileId);
        // 如果缓存中没有数据，返回null
        return null;
    }

    @Override
    @CachePut(value = "template:validation", key = "#fileId")
    public Object cacheValidationResult(String fileId, Object validationResult, long expireMinutes) {
        log.info("缓存验证结果，文件ID：{}，过期时间：{}分钟", fileId, expireMinutes);
        // 返回数据，Spring Cache会自动处理缓存存储
        return validationResult;
    }

    @Override
    @Cacheable(value = "template:validation", key = "#fileId")
    public Object getCachedValidationResult(String fileId) {
        log.info("从缓存获取验证结果，文件ID：{}", fileId);
        // 如果缓存中没有数据，返回null
        return null;
    }

    @Override
    @CachePut(value = "template:progress", key = "#taskId")
    public Object cacheImportProgress(String taskId, Object progress, long expireMinutes) {
        log.info("缓存导入进度，任务ID：{}，过期时间：{}分钟", taskId, expireMinutes);
        // 返回数据，Spring Cache会自动处理缓存存储
        return progress;
    }

    @Override
    @Cacheable(value = "template:progress", key = "#taskId")
    public Object getCachedImportProgress(String taskId) {
        log.info("从缓存获取导入进度，任务ID：{}", taskId);
        // 如果缓存中没有数据，返回null
        return null;
    }

    @Override
    @CachePut(value = "template:progress", key = "#taskId")
    public ImportProgress updateImportProgress(String taskId, int progress, String currentStep, 
                                   int processedCount, int totalCount, int errorCount) {
        log.info("更新导入进度，任务ID：{}，进度：{}%", taskId, progress);
        
        // 构建进度对象
        ImportProgress progressObj = new ImportProgress();
        progressObj.setTaskId(taskId);
        progressObj.setProgress(progress);
        progressObj.setCurrentStep(currentStep);
        progressObj.setProcessedCount(processedCount);
        progressObj.setTotalCount(totalCount);
        progressObj.setErrorCount(errorCount);
        progressObj.setStartTime(java.time.LocalDateTime.now());
        
        // 返回进度对象，Spring Cache会自动处理缓存存储
        return progressObj;
    }

    @Override
    @CacheEvict(value = {"template:data", "template:validation", "template:progress"}, allEntries = true)
    public void clearExpiredCache() {
        log.info("清理过期缓存");
        // Spring Cache通过@CacheEvict注解自动清理所有缓存
    }

    @Override
    public Map<String, Object> getCacheStatistics() {
        Map<String, Object> statistics = new HashMap<>();
        try {
            // Spring Cache统计信息
            statistics.put("cacheType", "Spring Cache");
            statistics.put("templateDataCount", "N/A - Spring Cache自动管理");
            statistics.put("validationResultCount", "N/A - Spring Cache自动管理");
            statistics.put("importProgressCount", "N/A - Spring Cache自动管理");
            statistics.put("totalCount", "N/A - Spring Cache自动管理");
            statistics.put("description", "使用Spring Cache注解管理缓存，无需手动统计");

            log.info("获取缓存统计信息成功：{}", statistics);
        } catch (Exception e) {
            log.error("获取缓存统计信息失败", e);
            statistics.put("error", e.getMessage());
        }
        return statistics;
    }

    @Override
    @CacheEvict(value = {"template:data", "template:validation", "template:progress"}, key = "#key")
    public void deleteCache(String key) {
        log.info("删除缓存，键：{}", key);
        // Spring Cache通过@CacheEvict注解自动删除指定键的缓存
    }

    @Override
    public boolean exists(String key) {
        log.info("检查缓存是否存在，键：{}", key);
        // Spring Cache自动管理缓存存在性，这里返回true表示缓存可能存在
        return true;
    }

    @Override
    public void expire(String key, long expireMinutes) {
        log.info("设置缓存过期时间，键：{}，过期时间：{}分钟", key, expireMinutes);
        // Spring Cache自动管理缓存过期时间
    }

    @Override
    public long getTtl(String key) {
        log.info("获取缓存剩余时间，键：{}", key);
        // Spring Cache自动管理缓存TTL，这里返回-1表示无法获取具体TTL
        return -1;
    }

    @Override
    @CachePut(value = "template:bytes", key = "#key")
    public byte[] cacheTemplateBytes(String key, byte[] data, long expireMinutes) {
        log.info("缓存模板字节数据，键：{}，数据大小：{}字节，过期时间：{}分钟", key, data != null ? data.length : 0, expireMinutes);
        // 返回数据，Spring Cache会自动处理缓存存储
        return data;
    }

    @Override
    @Cacheable(value = "template:bytes", key = "#key", unless = "#result == null")
    public byte[] getCachedTemplateBytes(String key) {
        log.info("从缓存获取模板字节数据，键：{}", key);
        // 如果缓存中没有数据，返回null，Spring Cache会缓存null值
        return null;
    }

}
